ArgumentOutOfRangeException List error c#

Question

Can someone please explain why this line does not work

dest = await GetDestinationContext(pbx.Nodes.FirstOrDefault(x => x.Id == dests[normalTsCount++]));

But this does

dest = await GetDestinationContext(pbx.Nodes.FirstOrDefault(x => x.Id == dests[normalTsCount]));
normalTsCount++;

The first line gives an ArgumentOutOfRangeException the first time it runs.

Does this answer your question? [Pre- & Post Increment in C#](https://stackoverflow.com/questions/8573190/pre-post-increment-in-c-sharp) — mamen, Feb 21 '23 at 10:15
@mamen the problem here has nothing to do with pre/post incrementation, it has to do with an incrementation being called multiple times because it is wrapped in a callback — sschwei1, Feb 21 '23 at 10:20

score 4 · Accepted Answer · answered Feb 21 '23 at 10:08

4

because at

dest = await GetDestinationContext(pbx.Nodes.FirstOrDefault(x => x.Id == dests[normalTsCount++]))

the normalTsCount++ incerements each iteration over Nodes

answered Feb 21 '23 at 10:08

fubo

1 Answers1